[clang] [llvm] [AMDGPU] Introduce asyncmark/wait intrinsics (PR #173259)

[Jay Foad via llvm-commits]

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@@ -457,6 +457,9 @@ class SIInsertWaitcnts {
   // message.
   DenseSet<MachineInstr *> ReleaseVGPRInsts;
 
+  // Track legacy async instructions to later remove CPol::ASYNC_pregfx12
+  SmallVector<MachineInstr *, 32> InstsWithAsyncCpolBit;
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jayfoad wrote:

```suggestion
  SmallVector<MachineInstr *> InstsWithAsyncCpolBit;
```

https://github.com/llvm/llvm-project/pull/173259